13F

Stock

Biogen Inc.

BIIB · held by 34 managers

Q1 2026Q4 2025Q3 2025Q2 2025Q1 2025

Reported value

$841.9M

Holders

34

+3 new · −2 exited

Holders’ est. mark

$24.4M

Price effect on 14 books still in the name

Largest holder

$315.4M

MORGAN STANLEY

Holder count by quarter

Q1 2015Q2 2015Q3 2015Q4 2015Q1 2016Q2 2016Q3 2016Q4 2016Q1 2017Q2 2017Q3 2017Q4 2017Q1 2018Q2 2018Q3 2018Q1 2019Q2 2019Q3 2019Q4 2019Q1 2020Q2 2020Q3 2020Q4 2020Q1 2021Q2 2021Q3 2021Q4 2021Q1 2022Q2 2022Q3 2022Q4 2022Q1 2023Q2 2023Q3 2023Q4 2023Q1 2024Q2 2024Q3 2024Q4 2024Q1 2025Q2 2025Q3 2025Q4 2025Q1 2026

Who holds it

Notable only
InvestorSharesValueEst. markChange
MORGAN STANLEY2.25M$315.4M—Held
BARCLAYS PLC1.36M$190.4M$11.6MAdded$90.3M
BANK OF AMERICA CORP /DE/1.22M$170.9M—Held
Employees Provident Fund Board704.2K$98.6M$10.2MAdded$10.2M
Hudson Bay Capital Management LP253.2K$35.5M—Held
Cresset Asset Management, LLC89.3K$12.5M$1.25MAdded$1.72M
Swiss Life Asset Management Ltd40.4K$5.67M$586KCut−$2.17M
Leonteq Securities AG23.1K$3.24M$335KCut−$10.4M
AIA Group Ltd22.2K$3.1M—Held
OP Asset Management Ltd17.1K$2.39M$247.6KCut−$224.8K
GROUPAMA ASSET MANAGMENT8.52K$1.19M—Held
Essential Partners LLC5.56K$778.7K$77.4KAdded$107.4K
Sanctuary Advisors, LLC3.8K$531.9K$46.1KAdded$132.4K
Savant Capital, LLC3.41K$478.3K$43.6KAdded$100.3K
Allworth Financial LP2.84K$397.8K—Held
DGS Capital Management, LLC1.71K$239.3K—New
INDEPENDENT FINANCIAL GROUP, LLC1.43K$200K—New
IFP Advisors, Inc1.1K$153.5K—Held
Aventura Private Wealth, LLC367$51.4K$5.32KAdded$922
WFA of San Diego, LLC253$35.4K—Held
MV CAPITAL MANAGEMENT, INC.194$27.2K—Held
Principia Wealth Advisory, LLC185$25.9K—Held
AllSquare Wealth Management LLC153$21.4K—Held
BROADWATER CAPITAL MANAGEMENT LLC100$14K$13.9KAdded$1.45K
Medallion Wealth Advisors, LLC73$10.2K$1.06KCut−$4.22K
Prestige Wealth Management Group LLC64$8.97K$551Added$4.19K
Saranac Partners Ltd57$7.99K—New
KBC Group NV35.5K$4.97K—Held
Kilter Group LLC35$4.9K—Held
Strategic Investment Solutions, Inc. /IL10$1.4K—Held
Clark Wealth Partners7$1.23K$353Added$353
Cape Investment Advisory, Inc.7$981—Held
NEW MEXICO EDUCATIONAL RETIREMENT BOARD6.62K$928—Held
FNY Investment Advisers, LLC13$1—Held

Who left

Positions as of Q3 2025. 13F filings arrive up to 45 days after quarter-end and omit shorts. Values are quarter-end marks, as filed. Estimated mark is the price effect on shares still held — not realized P&L or investment advice.